Hi, On Sat, Apr 24, 2010 at 8:20 PM, YONETANI Tomokazu <qhwt+f...@les.ath.cx> wrote: > Hello. > > The ServeRAID driver, or ips(4), seems to distinguish read or write requests > with a macro called ips_read_request(), which is defined as > > #define ips_read_request(iobuf) ((iobuf)->bio_cmd == BIO_READ) > > in its strategy routine and a few other places. So when the request is > BIO_FLUSH, the ips driver issues a write command (IPS_WRITE_CMD) with > length == 0, right? > > My question is, do ServeRAID controllers treat 0-byte write command > as a sync-to-disk request, or is there any command for that purpose? > There's a command called IPS_CACHE_FLUSH_CMD defined in ipsreg.h, > but it's not used anywhere in the normal code path.
It seems Linux driver is using it (on shutdown/reset) but I'm not sure if this would have some side effect, etc.? Cheers, -- Xin LI <delp...@delphij.net> http://www.delphij.net _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
